convenient没有错！错在你没讲清楚！

口语考试的核心：

体现自己的语言能力，需要持续的逻辑的输出，让考官有直观的感受

句型（适用科技类话题）：

All I have to do is ...

There is no need to do sth

（1）网上支付

It’s incredibly convenient.

All you have to do is whip out your phone, scan the QR code and payments complete. You are good to go.

There is no need to carry your wallet around or worry about getting the wrong change.

（2）点外卖

Definitely, all you gotta do is open up your food delivery app, pick whatever you’re craving and your food will be delivered to your doorstep within, like, 30 minutes or so.

And there is no need to dress up and physically head out to a restaurant.

（3）电子书

All you gotta to is whip out your kindle and you can instantly dive into a book.

There is no need to carry a physical book around, which can be super bulky and heavy.